Strong Gravity News & Events

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100 years of Strong Gravity, 5 years of Gr@v

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Physics Aphitheatre
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To celebrate the centenial of General Relativity and simulataneously celebrate five years of the Gravitation Group at the University of Aveiro (Gr@v), established in the Fall 2010, Gr@v will organize a two days event, on 25-26 November 2015. This event will also mark the closing of the "Numerical Relativity and High Energy Physics" Marie Curie IRSES action, an international partnership which was coordinated by our group that ran over the period 2012-2015. Finally, the event will also be integrated in the IDPASC doctoral programme.

At MG14

Gr@v team at the 14th Marcel Grossmann Meeting, in Rome: (from left to right) M. Wang, H. Rúnarsson, J. C. Degollado (former member), E. Radu, C. Herdeiro, M. Sampaio and J. Rosa, where we have presented ten talks on the various group's research lines.

Under Rome's July hot sun, this workshop could be described modifying Edison's quote: "Science can really be 99% perspiration..."

Rotating black holes in Lorentz-violating gravity theories

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Ian Vega (SISSA)
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GAP room
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Abstract: There is considerable interest in the strong-field behavior of Lorentz-violating gravity theories. One point of interest is whether or not the notion of a black hole as an absolute causal boundary persists in these theories, which can sometimes propagate signals infinitely fast. Past work on spherically-symmetric black holes reveal that absolute causal boundaries exist in spite of these infinitely-fast propagating modes. These causal boundaries have come to be known as universal horizons. In this talk, I shall discuss black holes in two popular Lorentz-violating theories, Hořava gravity and Einstein-aether theory, and showcase progress made in exploring their rotating black holes. For Hořava gravity, I shall discuss three-dimensional black holes in its infrared sector. Within this setting, we have derived the most general class of stationary, circularly symmetric, asymptotically anti–de Sitter black hole solutions. I also discuss slowly-rotating black holes in four-dimensional Einstein-aether theory, which we construct numerically. Most notably, we learn from these solutions that universal horizons may not be a generic feature of black holes in Lorentz-violating theories.

Higgs- and Skyrme-Chern-Simons densities in all dimensions

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Dikran Tchrakian (DIAS - Dublin)
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GAP room
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AbstractUsual Chern-Simons densities are defined only in odd dimensions. This is because they result from the one-dimension descent from the Chern-Pontryagin densities, and rely on the fact that the latter are total-divergence.